Literally got my CEntrance DACport Slim today on the mail. I tried my ATH-M50x on it and they sound fantastic, but I have been looking for open back cans for a good while now. Specifically I've been eyeballing the HD598se which go for around $160. Which would you guys recommend, the HD598s or the K7XX?

I have the 598se and the k7xx. For my money, the k7xx is clearly better. More comfortable for long listening sessions, much wider sound stage and noticeably greater clarity. The only drawback is that the k7xx needs a dac/amp to really open up, whereas the 598 can be run from an iphone with little difference.

If you can't find 598se at a substantially lower price than K7XX and you also have an amp spend the extra dough and get K7xx. If you don't have a good amp take the amp's price also into account while making the final call.

Yeah, the 598se have actually gone up in price since I started tracking them (the graph I posted is for the black version which has stayed at $151). I have the CEntrance DACport Slim so I'm getting the K7XX, thank you and everyone who posted useful advice.